To celebrate the screening of his upcoming crime flick Killing them Softly at the Cannes Film Festival in Cannes, France Tuesday, the actor partied at the flick's swanky after party.

The black-tie affair, which was sponsored by Johnnie Walker Blue Label and held at Villa St. George, attracted the likes of the 48-year-old actor, his costar Ray Liotta, Chris Tucker and P.Diddy — who stopped by to share a celebratory drink with the group before heading back to his yacht.

As the night went on and the lighthearted mood kept up, it appeared that the crowd wasn't just celebrating Pitt's latest flick.

"With Brad's impending wedding it almost had the feel of a sophisticated pre-bachelor party, with bottles of $390 Johnnie Walker whisky and plenty of cigars," a witness tells Us Weekly. "It was definitely a night for Brad to remember."

In April, Pitt asked Jolie (his partner of seven years and the mother of their six children together) to be his wife with a tablet-shaped diamond ring, estimated at 16 carats. But like the humanitarians they are, the couple won't be tying the knot until everyone around the world can legally do so.

"We actually, really and truly, have no date," he said during a press conference for his new film on Tuesday. "It's just something that makes sense to us, and certainly date-wise, it's just a rumor. We're still hoping that we can figure out marriage equality in the states before that date."